摘要 我们在本文中描述了一种新型的TEMPO氧铵盐引发的亚胺的Pictet-Spengler反应,该反应是从羰基化合物和含吡咯或吲哚的底物就地产生的,以提供4,5-二氢吡咯并[1,2- a ]喹喔啉或5,6 -二氢吲哚并[1,2- a ]喹喔啉的收率为好至极好。此外,通过使用一当量的氧铵盐的环化-脱氢过程,一锅合成重要的生物学重要的喹喔啉。 我们在本文中描述了一种新型的TEMPO氧铵盐引发的亚胺的Pictet-Spengler反应,该反应是从羰基化合物和含吡咯或吲哚的底物就地产生的,以提供4,5-二氢吡咯并[1,2- a ]喹喔啉或5,6 -二氢吲哚并[1,2- a ]喹喔啉的收率为好至极好。此外,通过使用一当量的氧铵盐的环化-脱氢过程,一锅合成重要的生物学重要的喹喔啉。
Elemental Sulfur Mediated Synthesis of Pyrrolo[1,2-a]quinoxalines from 1-(2-Nitroaryl)pyrroles
作者:Tung T. Nguyen、Nam T. S. Phan、Tuan H. Ho、Nhu T. A. Phan、Thuyen T. C. Ho、Duyen L. M. Tran
DOI:10.1055/a-1534-0466
日期:2021.11
Methods to afford pyrrolo[1,2-a]quinoxalines often require the use of prefunctionalized aniline precursors, transition metals, and/or harsh conditions. Herein we describe a simple coupling of 1-(2-nitroaryl)pyrroles and arylacetic acids, in the presence of elemental sulfur, to furnish the fused heterocycles in good yields. The conditions are compatible with many functionalities including ester, nitrile
Tin(<scp>ii</scp>) chloride dihydrate/choline chloride deep eutectic solvent: redox properties in the fast synthesis of <i>N</i>-arylacetamides and indolo(pyrrolo)[1,2-<i>a</i>]quinoxalines
作者:Sergio Alfonso Trujillo、Diana Peña-Solórzano、Oscar Rodríguez Bejarano、Cristian Ochoa-Puentes
DOI:10.1039/d0ra06871c
日期:——
In this contribution a physicochemical, IR and Raman characterization for the tin(II) chloride dihydrate/choline chloride eutectic mixture is reported. The redox properties of this solvent were also studied by cyclic voltammetry finding that it can be successfully used as an electrochemical solvent for electrosynthesis and electroanalytical processes and does not require negative potentials as verified
在这篇文章中,报道了氯化锡( II)二水合物/氯化胆碱低共熔混合物的物理化学、IR 和拉曼表征。还通过循环伏安法研究了这种溶剂的氧化还原性质,发现它可以成功地用作电合成和电分析过程的电化学溶剂,并且不需要负电位,正如硝基苯的还原所证实的那样。进一步探索了这种低共熔混合物作为氧化还原溶剂的潜在用途,以从多种硝基芳族化合物开始获得芳族胺和N-芳基乙酰胺。此外,一种构建一系列吲哚(pyrrolo)[1,2- a]喹喔啉是通过 1-(2-nitrophenyl)-1 H - indole(pyrrole) 与醛类反应而开发的。这个简单的协议为构建目标喹喔啉提供了一种简单的方法,反应时间短,产量高,其中关键步骤涉及串联一锅还原环化-氧化。
Palladium‐Catalyzed Primary Amine‐Directed Decarboxylative Annulation of
<i>α</i>
‐Oxocarboxylic Acids: Access to Indolo[1,2‐
<i>a</i>
]quinazolines
作者:Guangbin Jiang、Shoucai Wang、Jun Zhang、Jianwen Yu、Ziang Zhang、Fanghua Ji
DOI:10.1002/adsc.201900001
日期:2019.4.16
for the preparation of indolo[1,2‐a]quinazolines via palladium‐catalyzed decarboxylative annulation of indols with α‐oxocarboxylic acids has been realized by using primary amine as a directing group (DG). This transformation proceeds smoothly with exclusive regioselectivity and represents an one‐pot Dominosynthesis of indo‐lo[1,2‐a]quinazolines from α‐oxocarboxylic acids.
用于制备高效的协议吲哚并[1,2一]喹唑啉通过钯-催化的与indols的脱羧环α -oxocarboxylic酸已经通过使用伯胺作为定向基团(DG)实现。这种转化具有排他性区域选择性的顺利进行,代表了从α-氧代羧酸一锅多米诺合成吲哚[1,2- a ]喹唑啉的过程。
Efficient synthesis of pyrrolo[1,2-a]quinoxalines catalyzed by a Brønsted acid through cleavage of C–C bonds
作者:Caixia Xie、Lei Feng、Wanli Li、Xiaojun Ma、Xinkun Ma、Yihan Liu、Chen Ma
DOI:10.1039/c6ob01401a
日期:——
An efficient and convenient one-pot domino reaction for the direct synthesis of pyrrolo[1,2-a]quinoxalines has been developed. This approach utilizes an imine formation reaction, SEAr reaction and cleavage of C–C bonds catalyzed by a Brønsted acid. β-Diketones and β-keto esters are both well tolerated to give the corresponding products in moderate to excellent yields.
已经开发了用于直接合成吡咯并[1,2- a ]喹喔啉的有效且方便的一锅多米诺反应。该方法利用用于形成亚胺的反应,S È氩反应和裂解由布朗斯台德酸催化的C-C键。β-二酮和β-酮酯均具有良好的耐受性,可以以中等至极好的收率得到相应的产物。
Palladium-catalyzed sequential acylation/annulation of indoles with acyl chlorides using primary amine as the directing group
作者:Guangbin Jiang、Guang Yang、Xinqiang Liu、Shoucai Wang、Fanghua Ji
DOI:10.1039/d0nj04406g
日期:——
An attractive and convenient strategy for the direct acylation/annulation of indoles has been developed using Pd(0) as an efficient catalyst. The main feature of this protocol is the use of acyl chlorides as the acylating agents with the primary amine as the directing group. A variety of indolo[1,2-a]quinoxalines were readily obtained in reasonable efficiency and satisfactory yields with good functional
使用Pd(0)作为有效催化剂,已经开发出了一种有吸引力且方便的吲哚直接酰化/环化的策略。该方案的主要特征是使用酰氯作为酰化剂,并以伯胺为导向基团。各种吲哚并[1,2- a ]喹喔啉可以以合理的效率和令人满意的收率获得,并且具有良好的官能团耐受性。在控制实验的基础上,提出了初步的催化机理。